Overage Clauses at Auction: The Hidden Clawback on Your Profit

What Is an Overage Clause?

An overage (sometimes called "clawback" or "uplift") clause is a covenant in the title that entitles the seller — or their successors — to a share of any increase in value you unlock after completion, usually by getting planning permission or by developing the site. It's bolted onto the land itself, so it binds you even if you sell on before the trigger event happens.

Auction sellers love overage because it lets them sell cheaply now (often because the site has no planning consent) while keeping a stake in the upside. For a buyer, it's one of the few legal pack issues that doesn't just cost you money on day one — it can cost you money for the next 20 or 30 years.

This isn't the same as the generic "deal-killing clauses" most buyers already check for. Overage is a distinct mechanism, and it's easy to miss because it often sits in an old transfer deed from a previous sale, not in the current contract.

How Overage Actually Works

Most overage clauses share three components:

Trigger event — typically the grant of planning permission, implementation of that permission (first spade in the ground), or disposal of the property with the benefit of consent.
Payment percentage — commonly 25–50% of the uplift in value, calculated as the difference between the value with and without planning.
Duration — anywhere from 5 to 80 years. Older rural and edge-of-settlement plots sometimes carry overage with no realistic time limit.

Crucially, overage attaches to the land, not the person who agreed to it. If you buy a bungalow on a large plot subject to a 30% overage for 15 years, and you get planning for three extra houses in year 4, you owe the seller's estate (or whoever they assigned the benefit to) 30% of the resulting uplift — even though you had nothing to do with the original sale.

Where to Find It

Overage won't jump out at you from the auction catalogue. Check:

The title register (Charges Register, not Proprietorship Register) — look for a restriction or a notice referring to a deed of covenant or overage agreement.
The transfer deed (TR1) from the last sale, if it's included in the legal pack — overage is usually created here, not in the current sale contract.
Special conditions of sale — some auctioneers create a fresh overage specifically for this sale, so it'll be spelled out in plain English in the special conditions.

Our guide to reading an auction legal pack covers the standard document set — overage sits inside that same pack, so it's worth a dedicated read-through of the title register before you bid, not just a skim.

Worked Example

Say a 0.3-acre plot with a derelict bungalow comes up with a guide price of £140,000. No planning consent exists, but there's an obvious case for three new-build houses. The title register shows a 2009 transfer with a covenant: 30% overage on any uplift from residential development, running for 25 years from that date (so it expires in 2034).

You do the sums:

Value with planning for 3 houses (land value): £420,000
Value as sold (no planning, bungalow in situ): £140,000
Gross uplift: £280,000
Overage owed (30%): £84,000

So your real acquisition cost, once you secure planning, is £140,000 + £84,000 = £224,000 — not £140,000. That still leaves headroom against a £420,000 land value, but it's a very different deal from the one the guide price suggested, and it changes your bridging and build-cost maths materially. If you were planning to fund the purchase and planning application through auction finance, the overage liability needs to sit in your drawdown and exit calculations from day one — lenders will want to see it accounted for too.

How to Price Overage Into Your Bid

Get the clause reviewed before auction day, not after you've exchanged. A conveyancing solicitor can usually turn this around in 24–48 hours for a legal-pack review fee.
Identify the trigger precisely. "Grant of planning permission" is far more punishing than "implementation of planning permission" — the latter gives you the option to sit on consent and never trigger payment.
Check who benefits. If the overage has been assigned to a third party (a developer, a local authority, a family trust), negotiating a buyout becomes harder than if the original seller still holds it.
Model two outcomes: bid price assuming overage never triggers (you keep it as-is, no planning) versus bid price assuming it does. If the gap between those two numbers is small, overage isn't really hurting you. If it's large, build it into your maximum bid.
Ask about a deed of release or capped payment. Some sellers will negotiate a fixed buyout figure at completion rather than an open-ended percentage — worth proposing before the auction if you can get pre-auction contact with the vendor's solicitor.

The Postcode Pattern Worth Knowing

Overage turns up disproportionately on plots and part-garden sales in areas with live development pressure — edge-of-town land, large gardens near new transport links, and ex-agricultural parcels. Right now the busiest auction postcode areas on our tracker are Sheffield (S), the North East (NE), Plymouth (PL), the South West (SW) and North London (N) — all areas with active planning activity, so it's worth checking the title register specifically on any plot-adjacent lot in those regions.

Before You Bid

Pull the Charges Register, not just the Proprietorship Register
Request the historic TR1 if it's not already in the pack
Get a solicitor's view on the trigger wording, not just the headline percentage
Model your maximum bid with the overage liability included, not as an afterthought
Browse live lots on our deals page and flag any with large plots or part-garden sales for extra legal pack scrutiny

Overage doesn't usually kill a deal outright — but it reliably kills deals for buyers who find out about it after they've already exchanged.